Well - he may have been sleepwalking - no joke! Happened to us once; I'd forgotton to lock the front door to our apartment at night. Hubby and I went to bed (dog was already asleep & snoring), when I saw lights on downstairs. We both got up, I grabbed the dog's collar and hoisted him to his feet, errr paws, and the 3 of us headed down the stairs. There was a guy standing in our guest loo wearing nothing but his undies and taking a pee. My husband grabbed him by the arm and asked what the f.... he was doing, which obviously woke him up. He really had been sleepwalking from 3 floors above us and needless to say, he was slightly confused and more than a bit embarrassed.